I have to disagree. I had a similar problem where my SPS lost PE and then started to bleach and die. I tried checking voltage with a volt meter and read about 1 volt. Tried checking everything else that was suggested or I could think of and nothing made a difference.
Then one day I put my hand in the tank with a recent cut on my finger and the cut was buzzing. It was definitely electrical in nature. So I started unplugging components and when I unplugged my heater, the buzzing went away. Plugged it back in and the buzzing came back. I bought a new heater and ground probe the next day and within 12 hours my SPS started to show PE again and are now recovering nicely.
So I suspect voltage leaks are more common, and a more common source of problems, then we all realize. Whenever you have electrical components submerged in salt water, even only one or two, there is a risk of one developng a leak and introducing voltage/current to the tank.
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